Run the following command to view basic identification information of the inserted optical module: show fiber-ports optics-info <slot/port> The output includes module type, part number, vendor name, serial number, transmission rate, and other information derived from the. Run the following command to view basic identification information of the inserted optical module: show fiber-ports optics-info <slot/port> The output includes module type, part number, vendor name, serial number, transmission rate, and other information derived from the. This article provides instructions on how to view the Optical Module Status on your switch through the Command Line Interface (CLI). The Cisco Small Business Series Switches allow you to plug in a Small Form-factor Pluggable (SFP) transceiver in their optical modules to connect fiber optic cables. When optical modules operate on a switch, it is usually necessary to read the module's internal information to understand its working status—such as connection status and real-time metrics like optical power and temperature. DOM is supported on MS120, MS125, MS130, MS210. You can view the status of each port and the statistics of the devices connected to the switch, access the switch configuration, review and modify the configuration, and track how the switch is performing against key metrics that matter to you. The switch details page also has the tools that help. This guide gives a practical, CLI-focused workflow for checking SFP health and diagnostics on Cisco switches, shows the exact commands you'll use, explains what the numbers mean, and compares OEM (Cisco) vs third-party modules so you can pick the right SFP module supplier for reliability and cost. This guide provides complete, step-by-step CLI commands to view module type, DOM/DDM diagnostic data, vendor details, and compatibility information, fully compliant with Cisco IOS and IOS-XE command standards. Prerequisites for Accessing the Cisco Switch We will introduce how to query the.